libavformat/nsvdec.c

   1 /*
   2  * NSV decoder.
   3  * Copyright (c) 2004 The FFmpeg Project.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  */
  19 #include "avformat.h"
  20 #include "avi.h"
  21
  22 #define DEBUG
  23 //#define DEBUG_DUMP_INDEX // XXX dumbdriving-271.nsv breaks with it commented!!
  24 //#define DEBUG_SEEK
  25 #define CHECK_SUBSEQUENT_NSVS
  26 //#define DISABLE_AUDIO
  27
  28 /* max bytes to crawl for trying to resync
  29  * stupid streaming servers don't start at chunk boundaries...
  30  */
  31 #define NSV_MAX_RESYNC (500*1024)
  32 #define NSV_MAX_RESYNC_TRIES 300
  33
  34 /*
  35  * First version by Francois Revol - revol@free.fr
  36  * References:
  37  * (1) http://www.multimedia.cx/nsv-format.txt
  38  * seems someone came to the same conclusions as me, and updated it:
  39  * (2) http://www.stud.ktu.lt/~vitslav/nsv/nsv-format.txt
  40  *     http://www.stud.ktu.lt/~vitslav/nsv/
  41  * Sample files:
  42  * (S1) http://www.nullsoft.com/nsv/samples/
  43  * http://www.nullsoft.com/nsv/samples/faster.nsv
  44  * http://streamripper.sourceforge.net/openbb/read.php?TID=492&page=4
  45  */
  46
  47 /*
  48  * notes on the header (Francois Revol):
  49  *
  50  * It is followed by strings, then a table, but nothing tells
  51  * where the table begins according to (1). After checking faster.nsv,
  52  * I believe NVSf[16-19] gives the size of the strings data
  53  * (that is the offset of the data table after the header).
  54  * After checking all samples from (S1) all confirms this.
  55  *
  56  * Then, about NSVf[12-15], faster.nsf has 179700. When veiwing it in VLC,
  57  * I noticed there was about 1 NVSs chunk/s, so I ran
  58  * strings faster.nsv | grep NSVs | wc -l
  59  * which gave me 180. That leads me to think that NSVf[12-15] might be the
  60  * file length in milliseconds.
  61  * Let's try that:
  62  * for f in *.nsv; do HTIME="$(od -t x4 "$f" | head -1 | sed 's/.* //')"; echo "'$f' $((0x$HTIME))s = $((0x$HTIME/1000/60)):$((0x$HTIME/1000%60))"; done
  63  * except for nstrailer (which doesn't have an NSVf header), it repports correct time.
  64  *
  65  * nsvtrailer.nsv (S1) does not have any NSVf header, only NSVs chunks,
  66  * so the header seems to not be mandatory. (for streaming).
  67  *
  68  * index slice duration check (excepts nsvtrailer.nsv):
  69  * for f in [^n]*.nsv; do DUR="$(ffmpeg -i "$f" 2>/dev/null | grep 'NSVf duration' | cut -d ' ' -f 4)"; IC="$(ffmpeg -i "$f" 2>/dev/null | grep 'INDEX ENTRIES' | cut -d ' ' -f 2)"; echo "duration $DUR, slite time $(($DUR/$IC))"; done
  70  */
  71
  72 /*
  73  * TODO:
  74  * - handle timestamps !!!
  75  * - use index
  76  * - mime-type in probe()
  77  * - seek
  78  */
  79
  80 #ifdef DEBUG
  81 #define PRINT(_v) printf _v
  82 #else
  83 #define PRINT(_v)
  84 #endif
  85
  86 #if 0
  87 struct NSVf_header {
  88     uint32_t chunk_tag; /* 'NSVf' */
  89     uint32_t chunk_size;
  90     uint32_t file_size; /* max 4GB ??? noone learns anything it seems :^) */
  91     uint32_t file_length; //unknown1;  /* what about MSB of file_size ? */
  92     uint32_t info_strings_size; /* size of the info strings */ //unknown2;
  93     uint32_t table_entries;
  94     uint32_t table_entries_used; /* the left ones should be -1 */
  95 };
  96
  97 struct NSVs_header {
  98     uint32_t chunk_tag; /* 'NSVs' */
  99     uint32_t v4cc;      /* or 'NONE' */
 100     uint32_t a4cc;      /* or 'NONE' */
 101     uint16_t vwidth;    /* assert(vwidth%16==0) */
 102     uint16_t vheight;   /* assert(vheight%16==0) */
 103     uint8_t framerate;  /* value = (framerate&0x80)?frtable[frameratex0x7f]:framerate */
 104     uint16_t unknown;
 105 };
 106
 107 struct nsv_avchunk_header {
 108     uint8_t vchunk_size_lsb;
 109     uint16_t vchunk_size_msb; /* value = (vchunk_size_msb << 4) | (vchunk_size_lsb >> 4) */
 110     uint16_t achunk_size;
 111 };
 112
 113 struct nsv_pcm_header {
 114     uint8_t bits_per_sample;
 115     uint8_t channel_count;
 116     uint16_t sample_rate;
 117 };
 118 #endif
 119
 120 /* variation from avi.h */
 121 /*typedef struct CodecTag {
 122     int id;
 123     unsigned int tag;
 124 } CodecTag;*/
 125
 126 /* tags */
 127
 128 #define T_NSVF MKTAG('N', 'S', 'V', 'f') /* file header */
 129 #define T_NSVS MKTAG('N', 'S', 'V', 's') /* chunk header */
 130 #define T_TOC2 MKTAG('T', 'O', 'C', '2') /* extra index marker */
 131 #define T_NONE MKTAG('N', 'O', 'N', 'E') /* null a/v 4CC */
 132 #define T_SUBT MKTAG('S', 'U', 'B', 'T') /* subtitle aux data */
 133 #define T_ASYN MKTAG('A', 'S', 'Y', 'N') /* async a/v aux marker */
 134 #define T_KEYF MKTAG('K', 'E', 'Y', 'F') /* video keyframe aux marker (addition) */
 135
 136 #define TB_NSVF MKBETAG('N', 'S', 'V', 'f')
 137 #define TB_NSVS MKBETAG('N', 'S', 'V', 's')
 138
 139 /* hardcoded stream indices */
 140 #define NSV_ST_VIDEO 0
 141 #define NSV_ST_AUDIO 1
 142 #define NSV_ST_SUBT 2
 143
 144 enum NSVStatus {
 145     NSV_UNSYNC,
 146     NSV_FOUND_NSVF,
 147     NSV_HAS_READ_NSVF,
 148     NSV_FOUND_NSVS,
 149     NSV_HAS_READ_NSVS,
 150     NSV_FOUND_BEEF,
 151     NSV_GOT_VIDEO,
 152     NSV_GOT_AUDIO,
 153 };
 154
 155 typedef struct NSVStream {
 156     int frame_offset; /* current frame (video) or byte (audio) counter
 157                          (used to compute the pts) */
 158     int scale;
 159     int rate;
 160     int sample_size; /* audio only data */
 161     int start;
 162
 163     int new_frame_offset; /* temporary storage (used during seek) */
 164     int cum_len; /* temporary storage (used during seek) */
 165 } NSVStream;
 166
 167 typedef struct {
 168     int  base_offset;
 169     int  NSVf_end;
 170     uint32_t *nsvf_index_data;
 171     int index_entries;
 172     enum NSVStatus state;
 173     AVPacket ahead[2]; /* [v, a] if .data is !NULL there is something */
 174     /* cached */
 175     int64_t duration;
 176     uint32_t vtag, atag;
 177     uint16_t vwidth, vheight;
 178     //DVDemuxContext* dv_demux;
 179 } NSVContext;
 180
 181 static const CodecTag nsv_codec_video_tags[] = {
 182     { CODEC_ID_VP3, MKTAG('V', 'P', '3', ' ') },
 183     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
 184     { CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
 185 /*
 186     { CODEC_ID_VP4, MKTAG('V', 'P', '4', ' ') },
 187     { CODEC_ID_VP4, MKTAG('V', 'P', '4', '0') },
 188     { CODEC_ID_VP5, MKTAG('V', 'P', '5', ' ') },
 189     { CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
 190     { CODEC_ID_VP6, MKTAG('V', 'P', '6', ' ') },
 191     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
 192     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
 193     { CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
 194 */
 195     { CODEC_ID_XVID, MKTAG('X', 'V', 'I', 'D') }, /* cf sample xvid decoder from nsv_codec_sdk.zip */
 196     { CODEC_ID_RAWVIDEO, MKTAG('R', 'G', 'B', '3') },
 197     { 0, 0 },
 198 };
 199
 200 static const CodecTag nsv_codec_audio_tags[] = {
 201     { CODEC_ID_MP3, MKTAG('M', 'P', '3', ' ') },
 202     { CODEC_ID_AAC, MKTAG('A', 'A', 'C', ' ') },
 203     { CODEC_ID_AAC, MKTAG('A', 'A', 'C', 'P') }, /* _CUTTED__MUXED_2 Heads - Out Of The City.nsv */
 204     { CODEC_ID_PCM_U16LE, MKTAG('P', 'C', 'M', ' ') },
 205     { 0, 0 },
 206 };
 207
 208 static const uint64_t nsv_framerate_table[] = {
 209     ((uint64_t)AV_TIME_BASE * 30),
 210     ((uint64_t)AV_TIME_BASE * 30000 / 1001), /* 29.97 */
 211     ((uint64_t)AV_TIME_BASE * 25),
 212     ((uint64_t)AV_TIME_BASE * 24000 / 1001), /* 23.98 */
 213     ((uint64_t)AV_TIME_BASE * 30), /* ?? */
 214     ((uint64_t)AV_TIME_BASE * 15000 / 1001), /* 14.98 */
 215 };
 216
 217 //static int nsv_load_index(AVFormatContext *s);
 218 static int nsv_read_chunk(AVFormatContext *s, int fill_header);
 219
 220 #ifdef DEBUG
 221 static void print_tag(const char *str, unsigned int tag, int size)
 222 {
 223     printf("%s: tag=%c%c%c%c\n",
 224            str, tag & 0xff,
 225            (tag >> 8) & 0xff,
 226            (tag >> 16) & 0xff,
 227            (tag >> 24) & 0xff);
 228 }
 229 #endif
 230
 231 /* try to find something we recognize, and set the state accordingly */
 232 static int nsv_resync(AVFormatContext *s)
 233 {
 234     NSVContext *nsv = s->priv_data;
 235     ByteIOContext *pb = &s->pb;
 236     uint32_t v = 0;
 237     int i;
 238
 239     PRINT(("%s(), offset = %Ld, state = %d\n", __FUNCTION__, url_ftell(pb), nsv->state));
 240
 241     //nsv->state = NSV_UNSYNC;
 242
 243     for (i = 0; i < NSV_MAX_RESYNC; i++) {
 244         if (url_feof(pb)) {
 245             PRINT(("NSV EOF\n"));
 246             nsv->state = NSV_UNSYNC;
 247             return -1;
 248         }
 249         v <<= 8;
 250         v |= get_byte(pb);
 251 /*
 252         if (i < 8) {
 253             PRINT(("NSV resync: [%d] = %02x\n", i, v & 0x0FF));
 254         }
 255 */
 256
 257         if ((v & 0x0000ffff) == 0xefbe) { /* BEEF */
 258             PRINT(("NSV resynced on BEEF after %d bytes\n", i+1));
 259             nsv->state = NSV_FOUND_BEEF;
 260             return 0;
 261         }
 262         /* we read as big endian, thus the MK*BE* */
 263         if (v == TB_NSVF) { /* NSVf */
 264             PRINT(("NSV resynced on NSVf after %d bytes\n", i+1));
 265             nsv->state = NSV_FOUND_NSVF;
 266             return 0;
 267         }
 268         if (v == MKBETAG('N', 'S', 'V', 's')) { /* NSVs */
 269             PRINT(("NSV resynced on NSVs after %d bytes\n", i+1));
 270             nsv->state = NSV_FOUND_NSVS;
 271             return 0;
 272         }
 273
 274     }
 275     PRINT(("NSV sync lost\n"));
 276     return -1;
 277 }
 278
 279 static int nsv_parse_NSVf_header(AVFormatContext *s, AVFormatParameters *ap)
 280 {
 281     NSVContext *nsv = s->priv_data;
 282     ByteIOContext *pb = &s->pb;
 283     uint32_t tag, tag1, handler;
 284     int codec_type, stream_index, frame_period, bit_rate, scale, rate;
 285     unsigned int file_size, size, nb_frames;
 286     int64_t duration;
 287     int strings_size;
 288     int table_entries;
 289     int table_entries_used;
 290     int i, n;
 291     AVStream *st;
 292     NSVStream *ast;
 293
 294     PRINT(("%s()\n", __FUNCTION__));
 295
 296     nsv->state = NSV_UNSYNC; /* in case we fail */
 297
 298     size = get_le32(pb);
 299     if (size < 28)
 300         return -1;
 301     nsv->NSVf_end = size;
 302
 303     //s->file_size = (uint32_t)get_le32(pb);
 304     file_size = (uint32_t)get_le32(pb);
 305     PRINT(("NSV NSVf chunk_size %ld\n", size));
 306     PRINT(("NSV NSVf file_size %Ld\n", file_size));
 307
 308     duration = get_le32(pb); /* in ms */
 309     nsv->duration = duration * AV_TIME_BASE / 1000; /* convert */
 310     PRINT(("NSV NSVf duration %Ld ms\n", duration));
 311     // XXX: store it in AVStreams
 312
 313     strings_size = get_le32(pb);
 314     table_entries = get_le32(pb);
 315     table_entries_used = get_le32(pb);
 316     PRINT(("NSV NSVf info-strings size: %d, table entries: %d, bis %d\n",
 317             strings_size, table_entries, table_entries_used));
 318     if (url_feof(pb))
 319         return -1;
 320
 321     PRINT(("NSV got header; filepos %Ld\n", url_ftell(pb)));
 322
 323     if (strings_size > 0) {
 324         char *strings; /* last byte will be '\0' to play safe with str*() */
 325         char *p, *endp;
 326         char *token, *value;
 327         char quote;
 328
 329         p = strings = av_mallocz(strings_size + 1);
 330         endp = strings + strings_size;
 331         get_buffer(pb, strings, strings_size);
 332         while (p < endp) {
 333             while (*p == ' ')
 334                 p++; /* strip out spaces */
 335             if (p >= endp-2)
 336                 break;
 337             token = p;
 338             p = strchr(p, '=');
 339             if (!p || p >= endp-2)
 340                 break;
 341             *p++ = '\0';
 342             quote = *p++;
 343             value = p;
 344             p = strchr(p, quote);
 345             if (!p || p >= endp)
 346                 break;
 347             *p++ = '\0';
 348             PRINT(("NSV NSVf INFO: %s='%s'\n", token, value));
 349             if (!strcmp(token, "ASPECT")) {
 350                 /* don't care */
 351             } else if (!strcmp(token, "CREATOR") || !strcmp(token, "Author")) {
 352                 strncpy(s->author, value, 512-1);
 353             } else if (!strcmp(token, "Copyright")) {
 354                 strncpy(s->copyright, value, 512-1);
 355             } else if (!strcmp(token, "TITLE") || !strcmp(token, "Title")) {
 356                 strncpy(s->title, value, 512-1);
 357             }
 358         }
 359         av_free(strings);
 360     }
 361     if (url_feof(pb))
 362         return -1;
 363
 364     PRINT(("NSV got infos; filepos %Ld\n", url_ftell(pb)));
 365
 366     if (table_entries_used > 0) {
 367         nsv->index_entries = table_entries_used;
 368         nsv->nsvf_index_data = av_malloc(table_entries * sizeof(uint32_t));
 369         get_buffer(pb, nsv->nsvf_index_data, table_entries * sizeof(uint32_t));
 370     }
 371
 372     PRINT(("NSV got index; filepos %Ld\n", url_ftell(pb)));
 373
 374 #ifdef DEBUG_DUMP_INDEX
 375 #define V(v) ((v<0x20 || v > 127)?'.':v)
 376     /* dump index */
 377     PRINT(("NSV %d INDEX ENTRIES:\n", table_entries));
 378     PRINT(("NSV [dataoffset][fileoffset]\n", table_entries));
 379     for (i = 0; i < table_entries; i++) {
 380         unsigned char b[8];
 381         url_fseek(pb, size + nsv->nsvf_index_data[i], SEEK_SET);
 382         get_buffer(pb, b, 8);
 383         PRINT(("NSV [0x%08lx][0x%08lx]: %02x %02x %02x %02x %02x %02x %02x %02x"
 384            "%c%c%c%c%c%c%c%c\n",
 385            nsv->nsvf_index_data[i], size + nsv->nsvf_index_data[i],
 386            b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7],
 387            V(b[0]), V(b[1]), V(b[2]), V(b[3]), V(b[4]), V(b[5]), V(b[6]), V(b[7]) ));
 388     }
 389     //url_fseek(pb, size, SEEK_SET); /* go back to end of header */
 390 #undef V
 391 #endif
 392
 393     url_fseek(pb, nsv->base_offset + size, SEEK_SET); /* required for dumbdriving-271.nsv (2 extra bytes) */
 394
 395     if (url_feof(pb))
 396         return -1;
 397     nsv->state = NSV_HAS_READ_NSVF;
 398     return 0;
 399 }
 400
 401 static int nsv_parse_NSVs_header(AVFormatContext *s, AVFormatParameters *ap)
 402 {
 403     NSVContext *nsv = s->priv_data;
 404     ByteIOContext *pb = &s->pb;
 405     uint32_t vtag, atag;
 406     uint16_t vwidth, vheight;
 407     uint32_t framerate;
 408     uint16_t unknown;
 409     AVStream *st;
 410     NSVStream *nst;
 411     PRINT(("%s()\n", __FUNCTION__));
 412
 413     vtag = get_le32(pb);
 414     atag = get_le32(pb);
 415     vwidth = get_le16(pb);
 416     vheight = get_le16(pb);
 417     framerate = (uint8_t)get_byte(pb);
 418     /* XXX how big must the table be ? */
 419     /* seems there is more to that... */
 420     PRINT(("NSV NSVs framerate code %2x\n", framerate));
 421     framerate = (framerate & 0x80)?(nsv_framerate_table[framerate & 0x7F]):(framerate*AV_TIME_BASE);
 422     unknown = get_le16(pb);
 423 #ifdef DEBUG
 424     print_tag("NSV NSVs vtag", vtag, 0);
 425     print_tag("NSV NSVs atag", atag, 0);
 426     PRINT(("NSV NSVs vsize %dx%d\n", vwidth, vheight));
 427     PRINT(("NSV NSVs framerate %2x\n", framerate));
 428 #endif
 429
 430     /* XXX change to ap != NULL ? */
 431     if (s->nb_streams == 0) { /* streams not yet published, let's do that */
 432         nsv->vtag = vtag;
 433         nsv->atag = atag;
 434         nsv->vwidth = vwidth;
 435         nsv->vheight = vwidth;
 436         if (vtag != T_NONE) {
 437             st = av_new_stream(s, NSV_ST_VIDEO);
 438             if (!st)
 439                 goto fail;
 440
 441             nst = av_mallocz(sizeof(NSVStream));
 442             if (!nst)
 443                 goto fail;
 444             st->priv_data = nst;
 445             st->codec.codec_type = CODEC_TYPE_VIDEO;
 446             st->codec.codec_tag = vtag;
 447             st->codec.codec_id = codec_get_id(nsv_codec_video_tags, vtag);
 448             st->codec.width = vwidth;
 449             st->codec.height = vheight;
 450             st->codec.bits_per_sample = 24; /* depth XXX */
 451
 452             st->codec.frame_rate = framerate;
 453             st->codec.frame_rate_base = AV_TIME_BASE;
 454             av_set_pts_info(st, 64, AV_TIME_BASE, framerate);
 455             st->start_time = 0;
 456             st->duration = nsv->duration;
 457         }
 458         if (atag != T_NONE) {
 459 #ifndef DISABLE_AUDIO
 460             st = av_new_stream(s, NSV_ST_AUDIO);
 461             if (!st)
 462                 goto fail;
 463
 464             nst = av_mallocz(sizeof(NSVStream));
 465             if (!nst)
 466                 goto fail;
 467             st->priv_data = nst;
 468             st->codec.codec_type = CODEC_TYPE_AUDIO;
 469             st->codec.codec_tag = atag;
 470             st->codec.codec_id = codec_get_id(nsv_codec_audio_tags, atag);
 471             st->start_time = 0;
 472             st->duration = nsv->duration;
 473
 474             st->need_parsing = 1; /* for PCM we will read a chunk later and put correct info */
 475             /* XXX:FIXME */
 476             //st->codec.channels = 2; //XXX:channels;
 477             //st->codec.sample_rate = 1000;
 478             //av_set_pts_info(st, 64, 1, st->codec.sample_rate);
 479
 480 #endif
 481         }
 482 #ifdef CHECK_SUBSEQUENT_NSVS
 483     } else {
 484         if (nsv->vtag != vtag || nsv->atag != atag || nsv->vwidth != vwidth || nsv->vheight != vwidth) {
 485             PRINT(("NSV NSVs header values differ from the first one!!!\n"));
 486             //return -1;
 487         }
 488 #endif /* CHECK_SUBSEQUENT_NSVS */
 489     }
 490
 491     nsv->state = NSV_HAS_READ_NSVS;
 492     return 0;
 493 fail:
 494     /* XXX */
 495     nsv->state = NSV_UNSYNC;
 496     return -1;
 497 }
 498
 499 static int nsv_read_header(AVFormatContext *s, AVFormatParameters *ap)
 500 {
 501     NSVContext *nsv = s->priv_data;
 502     ByteIOContext *pb = &s->pb;
 503     uint32_t tag, tag1, handler;
 504     int codec_type, stream_index, frame_period, bit_rate, scale, rate;
 505     unsigned int size, nb_frames;
 506     int table_entries;
 507     int i, n, err;
 508     AVStream *st;
 509     NSVStream *ast;
 510
 511     PRINT(("%s()\n", __FUNCTION__));
 512     PRINT(("filename '%s'\n", s->filename));
 513
 514     nsv->state = NSV_UNSYNC;
 515     nsv->ahead[0].data = nsv->ahead[1].data = NULL;
 516
 517     for (i = 0; i < NSV_MAX_RESYNC_TRIES; i++) {
 518         if (nsv_resync(s) < 0)
 519             return -1;
 520         if (nsv->state == NSV_FOUND_NSVF)
 521             err = nsv_parse_NSVf_header(s, ap);
 522             /* we need the first NSVs also... */
 523         if (nsv->state == NSV_FOUND_NSVS) {
 524             err = nsv_parse_NSVs_header(s, ap);
 525             break; /* we just want the first one */
 526         }
 527     }
 528     if (s->nb_streams < 1) /* no luck so far */
 529         return -1;
 530     /* now read the first chunk, so we can attempt to decode more info */
 531     err = nsv_read_chunk(s, 1);
 532
 533     PRINT(("parsed header\n"));
 534     return 0;
 535 }
 536
 537 static int nsv_read_chunk(AVFormatContext *s, int fill_header)
 538 {
 539     NSVContext *nsv = s->priv_data;
 540     ByteIOContext *pb = &s->pb;
 541     AVStream *st[2] = {NULL, NULL};
 542     NSVStream *nst;
 543     AVPacket *pkt;
 544     uint32_t v = 0;
 545     int i, err = 0;
 546     uint8_t auxcount; /* number of aux metadata, also 4 bits of vsize */
 547     uint32_t vsize;
 548     uint16_t asize;
 549     uint16_t auxsize;
 550     uint32_t auxtag;
 551
 552     PRINT(("%s(%d)\n", __FUNCTION__, fill_header));
 553
 554     if (nsv->ahead[0].data || nsv->ahead[1].data)
 555         return 0; //-1; /* hey! eat what you've in your plate first! */
 556
 557 null_chunk_retry:
 558     if (url_feof(pb))
 559         return -1;
 560
 561     for (i = 0; i < NSV_MAX_RESYNC_TRIES && nsv->state < NSV_FOUND_NSVS && !err; i++)
 562         err = nsv_resync(s);
 563     if (err < 0)
 564         return err;
 565     if (nsv->state == NSV_FOUND_NSVS)
 566         err = nsv_parse_NSVs_header(s, NULL);
 567     if (err < 0)
 568         return err;
 569     if (nsv->state != NSV_HAS_READ_NSVS && nsv->state != NSV_FOUND_BEEF)
 570         return -1;
 571
 572     auxcount = get_byte(pb);
 573     vsize = get_le16(pb);
 574     asize = get_le16(pb);
 575     vsize = (vsize << 4) | (auxcount >> 4);
 576     auxcount &= 0x0f;
 577     PRINT(("NSV CHUNK %d aux, %ld bytes video, %d bytes audio\n", auxcount, vsize, asize));
 578     /* skip aux stuff */
 579     for (i = 0; i < auxcount; i++) {
 580         auxsize = get_le16(pb);
 581         auxtag = get_le32(pb);
 582         PRINT(("NSV aux data: '%c%c%c%c', %d bytes\n",
 583               (auxtag & 0x0ff),
 584               ((auxtag >> 8) & 0x0ff),
 585               ((auxtag >> 16) & 0x0ff),
 586               ((auxtag >> 24) & 0x0ff),
 587               auxsize));
 588         url_fskip(pb, auxsize);
 589         vsize -= auxsize + sizeof(uint16_t) + sizeof(uint32_t); /* that's becoming braindead */
 590     }
 591
 592     if (url_feof(pb))
 593         return -1;
 594     if (!vsize && !asize) {
 595         nsv->state = NSV_UNSYNC;
 596         goto null_chunk_retry;
 597     }
 598
 599     /* map back streams to v,a */
 600     if (s->streams[0])
 601         st[s->streams[0]->id] = s->streams[0];
 602     if (s->streams[1])
 603         st[s->streams[1]->id] = s->streams[1];
 604
 605     if (vsize/* && st[NSV_ST_VIDEO]*/) {
 606         nst = st[NSV_ST_VIDEO]->priv_data;
 607         pkt = &nsv->ahead[NSV_ST_VIDEO];
 608         av_new_packet(pkt, vsize);
 609         get_buffer(pb, pkt->data, vsize);
 610         pkt->stream_index = st[NSV_ST_VIDEO]->index;//NSV_ST_VIDEO;
 611         pkt->dts = nst->frame_offset++;
 612         pkt->flags |= PKT_FLAG_KEY; /* stupid format has no way to tell XXX: try the index */
 613 /*
 614         for (i = 0; i < MIN(8, vsize); i++)
 615             PRINT(("NSV video: [%d] = %02x\n", i, pkt->data[i]));
 616 */
 617     }
 618     if (asize/*st[NSV_ST_AUDIO]*/) {
 619         nst = st[NSV_ST_AUDIO]->priv_data;
 620         pkt = &nsv->ahead[NSV_ST_AUDIO];
 621         /* read raw audio specific header on the first audio chunk... */
 622         /* on ALL audio chunks ?? seems so! */
 623         if (asize && st[NSV_ST_AUDIO]->codec.codec_tag == MKTAG('P', 'C', 'M', ' ')/* && fill_header*/) {
 624             uint8_t bps;
 625             uint8_t channels;
 626             uint16_t samplerate;
 627             bps = get_byte(pb);
 628             channels = get_byte(pb);
 629             samplerate = get_le16(pb);
 630             asize-=4;
 631             PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
 632             if (fill_header) {
 633                 st[NSV_ST_AUDIO]->need_parsing = 0; /* we know everything */
 634                 if (bps != 16) {
 635                     PRINT(("NSV AUDIO bit/sample != 16 (%d)!!!\n", bps));
 636                 }
 637                 bps /= channels; // ???
 638                 if (bps == 8)
 639                     st[NSV_ST_AUDIO]->codec.codec_id = CODEC_ID_PCM_U8;
 640                 samplerate /= 4;/* UGH ??? XXX */
 641                 channels = 1;
 642                 st[NSV_ST_AUDIO]->codec.channels = channels;
 643                 st[NSV_ST_AUDIO]->codec.sample_rate = samplerate;
 644                 av_set_pts_info(st[NSV_ST_AUDIO], 64, 1,
 645                                 st[NSV_ST_AUDIO]->codec.sample_rate);
 646                 PRINT(("NSV RAWAUDIO: bps %d, nchan %d, srate %ld\n", bps, channels, samplerate));
 647             }
 648         }
 649         av_new_packet(pkt, asize);
 650         if (asize)
 651             get_buffer(pb, pkt->data, asize);
 652         pkt->stream_index = st[NSV_ST_AUDIO]->index;//NSV_ST_AUDIO;
 653         //pkt->dts = nst->frame_offset;
 654         //if (nst->sample_size)
 655         //    pkt->dts /= nst->sample_size;
 656         nst->frame_offset += asize; // XXX: that's valid only for PCM !?
 657     }
 658
 659     //pkt->flags |= PKT_FLAG_KEY;
 660     nsv->state = NSV_UNSYNC;
 661     return 0;
 662 }
 663
 664
 665 static int nsv_read_packet(AVFormatContext *s, AVPacket *pkt)
 666 {
 667     NSVContext *nsv = s->priv_data;
 668     ByteIOContext *pb = &s->pb;
 669     int i, err = 0;
 670
 671     PRINT(("%s()\n", __FUNCTION__));
 672
 673     /* in case we don't already have something to eat ... */
 674     if (nsv->ahead[0].data == NULL && nsv->ahead[1].data == NULL)
 675         err = nsv_read_chunk(s, 0);
 676     if (err < 0)
 677         return err;
 678
 679     /* now pick one of the plates */
 680     for (i = 0; i < 2; i++) {
 681         if (nsv->ahead[i].data) {
 682                 PRINT(("%s: using cached packet[%d]\n", __FUNCTION__, i));
 683             /* avoid the cost of new_packet + memcpy(->data) */
 684             memcpy(pkt, &nsv->ahead[i], sizeof(AVPacket));
 685             nsv->ahead[i].data = NULL; /* we ate that one */
 686             return pkt->size;
 687         }
 688     }
 689
 690     /* this restaurant is not approvisionned :^] */
 691     return -1;
 692 }
 693
 694 static int nsv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 695 {
 696     NSVContext *avi = s->priv_data;
 697     AVStream *st;
 698     NSVStream *ast;
 699     int frame_number, i;
 700     int64_t pos;
 701
 702     return -1;
 703 }
 704
 705 static int nsv_read_close(AVFormatContext *s)
 706 {
 707     int i;
 708     NSVContext *nsv = s->priv_data;
 709
 710     if (nsv->index_entries)
 711         av_free(nsv->nsvf_index_data);
 712
 713 #if 0
 714
 715     for(i=0;i<s->nb_streams;i++) {
 716         AVStream *st = s->streams[i];
 717         NSVStream *ast = st->priv_data;
 718         if(ast){
 719             av_free(ast->index_entries);
 720             av_free(ast);
 721         }
 722         av_free(st->codec.extradata);
 723         av_free(st->codec.palctrl);
 724     }
 725
 726 #endif
 727     return 0;
 728 }
 729
 730 static int nsv_probe(AVProbeData *p)
 731 {
 732     int i;
 733     PRINT(("nsv_probe(), buf_size %d\n", p->buf_size));
 734     /* check file header */
 735     if (p->buf_size <= 32)
 736         return 0;
 737     if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
 738         p->buf[2] == 'V' && p->buf[3] == 'f')
 739         return AVPROBE_SCORE_MAX;
 740     /* streamed files might not have any header */
 741     if (p->buf[0] == 'N' && p->buf[1] == 'S' &&
 742         p->buf[2] == 'V' && p->buf[3] == 's')
 743         return AVPROBE_SCORE_MAX;
 744     /* XXX: do streamed files always start at chunk boundary ?? */
 745     /* or do we need to search NSVs in the byte stream ? */
 746     /* seems the servers don't bother starting clean chunks... */
 747     /* sometimes even the first header is at 9KB or something :^) */
 748     for (i = 1; i < p->buf_size - 3; i++) {
 749         if (p->buf[i+0] == 'N' && p->buf[i+1] == 'S' &&
 750             p->buf[i+2] == 'V' && p->buf[i+3] == 's')
 751             return AVPROBE_SCORE_MAX-20;
 752     }
 753     /* so we'll have more luck on extension... */
 754     if (match_ext(p->filename, "nsv"))
 755         return AVPROBE_SCORE_MAX-20;
 756     /* FIXME: add mime-type check */
 757     return 0;
 758 }
 759
 760 static AVInputFormat nsv_iformat = {
 761     "nsv",
 762     "NullSoft Video format",
 763     sizeof(NSVContext),
 764     nsv_probe,
 765     nsv_read_header,
 766     nsv_read_packet,
 767     nsv_read_close,
 768     nsv_read_seek,
 769 };
 770
 771 int nsvdec_init(void)
 772 {
 773     av_register_input_format(&nsv_iformat);
 774     return 0;
 775 }